Effect of TiO2 on enhanced pyroelectric activity of PVDF composite

Thin films of a ferroelectric polymer matrix made of poly(vinylidene fluoride) (PVDF) incorporated with a non-ferroelectric inclusion, TiO2, were prepared with different volume fractions (0–30 wt%). The dielectric and pyroelectric properties of the PVDF/TiO2 composite thin films are revealed as a function of different annealing temperatures (60 to 140 °C). Theoretical models, including Maxwell, Clausius–Mossotti, Furukawa and effective medium theory models were employed to describe the effective dielectric permittivity of the composites. This report also studies the effect of a non-ferroelectric inclusion, which contributed to the enhancement of pyroelectric activity after the poling process, in a ferroelectric polymer matrix based composite. An increase in the dc conductivity of the polymer matrix led to an easier poling process and reduced the required poling electric field from 260 to 120 MV  m−1. The pyroelectric coefficient of the polymer composite has been enhanced at a much lower poling electric field. The surface and structural properties of the thin film composites were also characterized by scanning electron micrographs, Fourier transform infrared spectroscopy and x-ray diffractometry.

[1]  D. Y. Yoon,et al.  Formation of a New Crystal Form (αp) of Poly(vinylidene fluoride) under Electric Field , 1978 .

[2]  E. Fukada,et al.  Electromechanical Properties in the Composites of Epoxy Resin and PZT Ceramics , 1976 .

[3]  J. Scott Switching of Ferroelectrics Without Domains , 2010, Advanced materials.

[4]  G. R. Crane,et al.  Pyroelectricity and Optical Second Harmonic Generation in Polyvinylidene Fluoride Films , 1971 .

[5]  T. Furukawa Ferroelectric properties of vinylidene fluoride copolymers , 1989 .

[6]  Ming Zhang,et al.  Mechanical response of barium-titanate/polymer 0–3 ferroelectric nano-composite film under uniaxial tension , 2009 .

[7]  Shigeo Nakamura,et al.  Transition temperature of cellulose triacetate as observed by gas chromatography , 1971 .

[8]  M. G. Broadhurst,et al.  Physical basis for piezoelectricity in PVDF , 1984 .

[9]  Toshihisa Horiuchi,et al.  Pyroelectricity of Ferroelectric Vinylidene Fluoride-Oligomer-Evaporated Thin Films , 2003 .

[10]  F. G. Shin,et al.  Pyroelectric activity of ferroelectric PT/PVDF-TRFE , 2000 .

[11]  R. Gregorio,et al.  Effect of crystalline phase, orientation and temperature on the dielectric properties of poly (vinylidene fluoride) (PVDF) , 1999 .

[12]  W. C. Gan,et al.  The Effect of Gases on Pyroelectric Properties of PVDF/TiO 2 Treated by Plasma Etcher , 2009 .

[13]  G. Tsangaris,et al.  Interfacial relaxation phenomena in particulate composites of epoxy resin with copper or iron particles , 1996 .

[14]  S. Lang Pyroelectricity: From Ancient Curiosity to Modern Imaging Tool , 2005 .

[15]  D. K. Gupta,et al.  Changes in x‐ray diffraction patterns of polyvinylidene fluoride due to corona charging , 1977 .

[16]  Bernd Ploss,et al.  Pyroelectric or piezoelectric compensated ferroelectric composites , 2000 .

[17]  R. Gregorio,et al.  Effect of crystallization temperature on the crystalline phase content and morphology of poly(vinylidene fluoride) , 1994 .

[18]  Steven C. Roth,et al.  Electric‐field‐induced phase changes in poly(vinylidene fluoride) , 1978 .

[19]  Lei Zhu,et al.  Effects of Polymorphism and Crystallite Size on Dipole Reorientation in Poly(vinylidene fluoride) and Its Random Copolymers , 2010 .

[20]  R. Gregorio,et al.  Effect of crystallization rate on the formation of the polymorphs of solution cast poly(vinylidene fluoride) , 2008 .

[21]  Yang Rao,et al.  A precise numerical prediction of effective dielectric constant for polymer-ceramic composite based on effective-medium theory , 2000 .

[22]  D. Das-gupta,et al.  Piezoelectricity in uniaxially stretched and corona poled polyvinylidene fluoride , 1980 .

[23]  J. Scott,et al.  Applications of Modern Ferroelectrics , 2007, Science.

[24]  K. Yasuda,et al.  Dielectric and conductive spectra of the composite of barium titanate and LiClO/sub 4/-doped polyethylene oxide , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[25]  Y. Wada,et al.  Piezoelectricity, pyroelectricity, and the electrostriction constant of poly(vinylidene fluoride) , 1971 .

[26]  Lei Zhu,et al.  Novel Ferroelectric Polymers for High Energy Density and Low Loss Dielectrics , 2012 .

[27]  K. T. Varughese,et al.  Dielectric properties of Poly(vinylidene fluoride)/CaCu3Ti4O12 composites , 2010, 1301.4054.

[28]  Lei Zhu,et al.  Crystal Orientation Effect on Electric Energy Storage in Poly(vinylidene fluoride-co-hexafluoropropylene) Copolymers , 2010 .

[29]  T. Furukawa,et al.  Crystal forms and ferroelectric properties of poly(vinylidene fluoride)/polyamide 11 blends prepared by high‐shear processing , 2007 .

[30]  E. Fukada,et al.  Piezoelectric Relaxation in Composite Epoxy-PZT System due to Tonic Conduction , 1977 .

[31]  D. Das-gupta,et al.  A study of structural and electrical properties of stretched polyvinylidene fluoride films , 1979 .

[32]  C. Choy,et al.  Poling study of PZT/P(VDF–TrFE) composites , 2001 .

[33]  E. Fukada,et al.  Piezoelectric properties in the composite systems of polymers and PZT ceramics , 1979 .

[34]  D. Das-gupta,et al.  Piezo- and pyroelectric behaviour of corona-charged polyvinylidene fluoride , 1978 .

[35]  Y. Poon,et al.  Dielectric and pyroelectric properties of lead zirconate titanate/polyurethane composites , 2004 .

[36]  Kwang Man Kim,et al.  Characterization of poly(vinylidenefluoride-co-hexafluoropropylene)-based polymer electrolyte filled with rutile TiO2 nanoparticles , 2003 .

[37]  H. Kawai,et al.  The Piezoelectricity of Poly (vinylidene Fluoride) , 1969 .